Dirt Bike Engine
Dirt Bike Engine Parts at JJ Motorsports
Discover a full range of dirt bike engine components for rebuilding or upgrading your performance from JJ Motorsports. From crankshafts to cylinder heads and piston kits, these precision-engineered components ensure reliable performance. For additional upgrades, check out our full selection of off-road dirt bike parts to keep your engine running at peak efficiency on the track or trails.
Shop trusted brands like Wiseco for forged piston kits and K&N for high-flow oil filters. Explore related categories such as Dirt Bike Air and Fuel for intake upgrades or Dirt Bike Exhaust for complete systems.
Browse our in-stock inventory below with same-day shipping and expert support. Questions? Contact us for fitment advice!
- Product
- Qty in Cart
- Quantity
- Price
- Subtotal
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MOOSE RACING Countershaft Sprocket Seal Kit - Honda 25-4008
MOOSE RACING
$21.95Countershaft seal failure is one of the fastest ways to lose engine oil pressure and compromise your transmission's longevity. The MOOSE RACING Countershaft Sprocket Seal Kit delivers OEM-grade...09350435- SKU:
- 09350435
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- APPLICATION:
- COUNTERSHAFT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- SEAL KIT
- RIDING STYLE:
- STREET
$21.95 -
MOOSE RACING Crank Bearings and Seals 24-1047
MOOSE RACING
$70.95Crank bearing wear is one of the most common failure points in 2-stroke engines, leading to loss of compression, increased friction, and eventual catastrophic seizure. The MOOSE RACING 24-1047 kit...09240007- SKU:
- 09240007
- Availability:
- Ships Same Business Day
- Weight:
- 1.69 LBS
- APPLICATION:
- CRANKSHAFT
- PRODUCT NAME:
- BEARING
- TYPE:
- BALL
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$70.95 -
MOOSE RACING Crank Bearing - Yamaha 24-1066
MOOSE RACING
$84.95A worn or failing crankshaft bearing will rob your 2-stroke of responsiveness and reliability when you need it most. MOOSE Racing's precision-engineered crank bearing kit restores original...09240214- SKU:
- 09240214
- Availability:
- Ships Same Business Day
- Weight:
- 1.65 LBS
- APPLICATION:
- CRANKSHAFT
- RIDING STYLE:
- STREET
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- BEARING
- TYPE:
- BALL
$84.95Qty in Cart: 0Quantity:Price:$84.95Subtotal: -
MOOSE RACING Crank Bearing - KTM 24-1097
MOOSE RACING
$134.95A worn or failing crank bearing will sabotage your engine's reliability and performance, leading to catastrophic damage if ignored. MOOSE Racing's precision-engineered crank bearings restore your...09240219- SKU:
- 09240219
- Availability:
- Ships Same Business Day
- Weight:
- 1.81 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- RIDING STYLE:
- STREET
- APPLICATION:
- CRANKSHAFT
- PRODUCT NAME:
- BEARING
- TYPE:
- BALL
$134.95 -
MOOSE RACING Crank Bearing - KTM 24-1098
MOOSE RACING
$148.95Worn crank bearings are one of the leading causes of catastrophic 2-stroke engine failure, and replacing them is non-negotiable for maintaining reliability and power delivery. The MOOSE RACING Crank...09240220- SKU:
- 09240220
- Availability:
- Ships Same Business Day
- Weight:
- 1.26 LBS
- PRODUCT NAME:
- BEARING
- TYPE:
- BALL
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- APPLICATION:
- CRANKSHAFT
$148.95 -
MOOSE RACING Clutch Cylinder Guard - Husqvarna 13-216
MOOSE RACING
$42.95Hydraulic clutch cylinders are vulnerable to chain slap and impact damage during aggressive riding—damage that can leave you stranded. The MOOSE RACING Clutch Cylinder Guard shields this critical...09500798- SKU:
- 09500798
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
- TYPE:
- SLAVE CYLINDER
- MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- CASE SAVER
- RIDING STYLE:
- STREET
- COLOR/FINISH:
- ANODIZED
- COLOR/FINISH:
- BLACK
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$42.95Qty in Cart: 0Quantity:Price:$42.95Subtotal: -
MOOSE RACING Clutch Cover Gasket 817785
MOOSE RACING
$9.60A leaking clutch cover gasket compromises engine sealing and invites oil contamination into your drivetrain—a costly problem that compounds quickly. The MOOSE RACING Clutch Cover Gasket 817785...09340565- SKU:
- 09340565
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH COVER
- UNITS:
- EACH
$9.60 -
MOOSE RACING Complete Motor Gasket Kit - TTR/XT 808643
MOOSE RACING
$84.78A complete engine and transmission rebuild demands gaskets and seals that meet OEM specifications without the OEM price tag. The MOOSE RACING Complete Motor Gasket Kit delivers genuine reliability...09340625- SKU:
- 09340625
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
- TYPE:
- ENGINE
$84.78 -
MOOSE RACING Top End Gasket Kit - KTM 400/450 810317
MOOSE RACING
$98.96A top-end rebuild demands precision gaskets and seals that won't compromise engine integrity or force you to choose between quality and cost. This MOOSE RACING kit supplies everything you need to...09340627- SKU:
- 09340627
- Availability:
- Ships Same Business Day
- Weight:
- 0.17 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- RIDING STYLE:
- ATV
- TYPE:
- TOP END
$98.96Qty in Cart: 0Quantity:Price:$98.96Subtotal: -
MOOSE RACING Motor Gasket Kit with Seal - CR250 811256
MOOSE RACING
$78.83A complete engine and transmission rebuild demands OEM-quality gaskets and seals without the premium price tag. This Moose Racing kit eliminates the hassle of sourcing individual components—every...M811256- SKU:
- M811256
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
- TYPE:
- ENGINE
$78.83Qty in Cart: 0Quantity:Price:$78.83Subtotal: -
MOOSE RACING Top End Gasket Kit - RM 250 810575
MOOSE RACING
$37.94A top-end rebuild demands precision-fit gaskets and seals that won't compromise your engine's integrity or performance. The MOOSE RACING Top End Gasket Kit gives you every component needed for a...M810575- SKU:
- M810575
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- TYPE:
- TOP END
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$37.94Qty in Cart: 0Quantity:Price:$37.94Subtotal: -
MOOSE RACING Top End Gasket Kit - RM 250 810577
MOOSE RACING
$37.94Whether you're rebuilding after a piston replacement or looking for a cost-effective compression increase, a complete top-end gasket kit eliminates the guesswork and expense of sourcing individual...M810577- SKU:
- M810577
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
$37.94Qty in Cart: 0Quantity:Price:$37.94Subtotal: -
MOOSE RACING Complete Motor Gasket Kit - YZ450F/WR450F 808997
MOOSE RACING
$143.44A complete engine rebuild requires precision gaskets and seals that won't fail mid-season. The MOOSE RACING Complete Motor Gasket Kit eliminates the guesswork of sourcing individual components,...09346104- SKU:
- 09346104
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
- TYPE:
- ENGINE
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- GASKET
$143.44 -
MOOSE RACING Complete Motor Gasket Kit - FE250 808999
MOOSE RACING
$62.57A complete engine and transmission rebuild demands gasket and seal sets engineered for precision fit and long-term durability. The MOOSE RACING Complete Motor Gasket Kit eliminates the frustration of...09346106- SKU:
- 09346106
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
$62.57Qty in Cart: 0Quantity:Price:$62.57Subtotal: -
MOOSE RACING Top End Gasket Kit - KX 125 810421
MOOSE RACING
$30.57A top-end rebuild demands gasket and seal quality that matches OEM standards without the OEM price tag. This Moose Racing kit eliminates the guesswork—every component you need comes in one set,...M810421- SKU:
- M810421
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- TOP END
$30.57 -
MOOSE RACING Top End Gasket Kit - KX 125 810422
MOOSE RACING
$35.01When you're rebuilding a KX 125 top end, you need gaskets and seals that won't compromise your engine's integrity or your wallet. The MOOSE RACING Top End Gasket Kit delivers OEM-quality components...M810422- SKU:
- M810422
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- UNITS:
- KIT
- TYPE:
- TOP END
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
$35.01 -
MOOSE RACING Top End Gasket Kit - KX 125 810426
MOOSE RACING
$35.01A top-end rebuild demands precision components that won't compromise engine integrity or performance. This Moose Racing gasket kit eliminates the guesswork by providing every seal, O-ring, and gasket...M810426- SKU:
- M810426
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- TOP END
$35.01 -
MOOSE RACING Top End Gasket Kit - KX 125 810427
MOOSE RACING
$42.36A top-end rebuild demands precision gaskets and seals that won't let you down mid-season. The MOOSE RACING Top End Gasket Kit delivers OEM-quality replacement seals at a fraction of the cost, so you...M810427- SKU:
- M810427
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- TYPE:
- TOP END
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$42.36 -
MOOSE RACING Motor Gasket Kit with Seal - KX250 811452
MOOSE RACING
$56.08A complete engine and transmission rebuild demands precision-fit gaskets and seals—compromising on these components introduces oil leaks, compression loss, and premature failure. The MOOSE RACING...M811452- SKU:
- M811452
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- TYPE:
- ENGINE
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
- TYPE:
- COMPLETE
- RIDING STYLE:
- OFF-ROAD
$56.08Qty in Cart: 0Quantity:Price:$56.08Subtotal: -
MOOSE RACING Top End Gasket Kit - KX 250 810454
MOOSE RACING
$40.87A top-end rebuild demands precision and reliability—cutting corners on gaskets and seals is a guaranteed path to failure. The MOOSE RACING Top End Gasket Kit delivers OEM-equivalent performance at a...M810454- SKU:
- M810454
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- UNITS:
- KIT
- TYPE:
- TOP END
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
$40.87
